Two coils are placed close to each other. The mutual inductance of the pair of coils depends upon
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C
The coupled flux of two coils system is used to define the mutual inductance between the coils. The mutual inductance between the coils is 
So it is defined as the proportionality between the emf generated in coil 2 due to the current flows in coil 1 . Thus It depends on the relative position and orientation of two coils.
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